Whoa! "Do med school anyways...because it can't hurt. Just don't get into too much debt."
I am not a physician but have several relatives that are and I am a patent attorney who helps many physicians start biotechnology companies. Many of them are not happy precisely because they followed this "what else should I do mentality." Finding work you love and that pays well is a difficult journey and it is foolish to think that filling the next 8-10 years of your life with school/residency is going to automatically solve that problem for you. Although it feels like you have to hurry up and do everything now, you don't. If you start med school not knowing if its what you want to do or not at 22 and then you absolutely hate your life, at some point, the inertia will carry you through and you will do it because you feel like you "have to." If you are older, but more certain it is what you want to do, then you will probably have a totally different experience. So, bottom line, take the time you need to find out if it is what you want to do - and that is the same for graduate school of any kind.
On writing, I agree. If you want to find out if you want to be a writer, write. Can you handle the isolation? The frustration? Read the book "Forest for the Trees" - can't remember the author, but she is a poet, former editor, and currently a literary agent at one of the most prestigious firms. After reading her book, you come away with the feeling that the only people who should write are those that have to. She also talks about MFA programs.
And, for the 500 lb. gorilla in the room...where do I get off saying anything about this when I am an attorney, who are supposed to be the most unhappy professionals out there. Well, experience. I went to law school originally "to help people." I went to top school but with scholarships and the low tuition at a state school, I graduated with no debt. I was offered $125K to start at the age of 25. Now, almost 5 years later, I am making more than double that and I still can't leave. I can't imagine how hard it is to leave medicine if you are miserable because you are making a ton of money, but you need it to pay off your debt and you have invested much more than 3 years into it. Fortunately, I have been able to save a ton of $$$ that I am using to do other things and explore other options and law is something that I can do from home should I choose too. So, I guess I am just saying be sure this is what you want because life comes at you fast - kids, marriage, house payments change everything. You don't want to be stuck in job that you don't enjoy.